Identifying Elements of the Routing Table Exercise
Lab 3-3: Subnetting Scenario 3 (3.5.4)
Instructor note: This lab is impossible to complete with fixed-length subnet masking. Use this lab as a scaf-folding exercise to link the student to the concept of VLSM, which is discussed in Chapter 6, “VLSM and CIDR.” Avoid offering the student any help in solving the problem of not having enough address space.
Upon completion of this lab, you will be able to
■ Determine the number of subnets needed
■ Determine the number of hosts needed
■ Design an appropriate addressing scheme
■ Conduct research to find a possible solution Scenario
In this lab, you have been given the network address 192.168.1.0/24 to subnet and provide the IP addressing for the network shown in Figure 3-5. The network has the following addressing requirements:
■ The BRANCH1 LAN 1 will require 15 host IP addresses.
■ The BRANCH1 LAN 2 will require 15 host IP addresses.
■ The BRANCH2 LAN 1 will require 15 host IP addresses.
■ The BRANCH2 LAN 2 will require 15 host IP addresses.
■ The HQ LAN will require 30 host IP addresses.
■ The link from HQ to BRANCH1 will require an IP address for each end of the link.
■ The link from HQ to BRANCH2 will require an IP address for each end of the link.
■ The link from HQ to Branch 3 will require an IP address for each end of the link.
Figure 3-5 Topology Diagram for Subnetting Scenario 3
PC1
Table 3-9 provides a rough outline for you to assign the IP addresses, subnet masks, and default gate-ways (where applicable) for the devices shown in the network topology of Figure 3-5.
Table 3-9 Addressing Table for Lab 3-3
Device Interface IP Address Subnet Mask Default Gateway
HQ Fa0/1 —
Device Interface IP Address Subnet Mask Default Gateway
PC1 NIC
PC2 NIC
PC3 NIC
PC4 NIC
PC5 NIC
Task 1: Examine the Network Requirements
Examine the network requirements and answer the questions that follow. Keep in mind that IP addresses will be needed for each of the LAN interfaces.
How many subnets are needed? 8
What is the maximum number of IP addresses that are needed for a single subnet? 31 How many IP addresses are needed for each of the branch LANs? 16
What is the total number of IP addresses that are needed? 101
Task 2: Design an IP Addressing Scheme
Subnet the 192.168.1.0/24 network into the appropriate number of subnets.
Can the 192.168.1.0/24 network be subnetted to fit the network requirements? no
If the “number of subnets” requirement is met, what is the maximum number of hosts per subnet? 30 If the “maximum number of hosts” requirement is met, what is the number of subnets that will be available to use? 2
Task 3: Reflection
You do not have enough address space to implement an addressing scheme. Research this problem and propose a possible solution. Increasing the size of your original address space is not an acceptable solution. (Hint: We will discuss solutions to this problem in Chapter 6, “VLSM and CIDR.”)
Attempt to implement your solution using Packet Tracer. You can now open the file
LSG02-Lab354.pka on the CD-ROM that accompanies this book to apply and verify your addressing scheme.
Check to see that all devices on directly connected networks can ping each other.
Successful implementation of a solution requires that
■ Only the 192.168.1.0/24 address space is used.
■ PCs and routers can ping all IP addresses.
Packet Tracer Companion
Packet Tracer Skills Integration Challenge
Introduction
This activity focuses on subnetting skills, basic device configurations, and static routing. After you configure all devices, test for end-to-end connectivity and examine your configuration. Open the file LSG02-PTSkills3.pka on the CD-ROM that accompanies this book. Use the topology in Figure 3-6 and the addressing table in Table 3-10 to document your design.
Upon completion of this lab, you will be able to
■ Design and document an addressing scheme based on requirements
■ Select appropriate equipment and cable the devices
■ Apply a basic configuration to the devices
■ Configure static and default routing
■ Verify full connectivity between all devices in the topology
Figure 3-6 Packet Tracer Skills Integration Challenge Topology Packet Tracer
Table 3-10 provides a rough outline for you to assign the IP addresses and subnet masks for the devices shown in the network topology of Figure 3-6.
Table 3-10 Addressing Table for Packet Tracer Skills Integration Challenge
Device Interface IP Address Subnet Mask
HQ Fa0/0 192.168.0.129 255.255.255.224
Fa0/1 192.168.0.161 255.255.255.224
S0/0/0 10.0.0.1 255.255.255.252
S0/0/1 10.0.0.5 255.255.255.252
S0/1/0 10.0.0.9 255.255.255.252
S0/1/1 209.165.201.2 255.255.255.252
B1 Fa0/0 192.168.1.1 255.255.255.192
Fa0/1 192.168.1.65 255.255.255.192
Fa1/0 192.168.1.129 255.255.255.192
Fa1/1 192.168.1.193 255.255.255.192
S0/0/0 10.0.0.2 255.255.255.252
B2 Fa0/0 172.16.0.1 255.255.252.0
Fa0/1 172.16.4.1 255.255.252.0
Fa1/0 172.16.8.1 255.255.252.0
Fa1/1 172.16.12.1 255.255.252.0
S0/0/0 10.0.0.6 255.255.255.252
B3 Fa0/0 172.20.0.1 255.255.224.0
Fa0/1 172.20.32.1 255.255.224.0
Fa1/0 172.20.64.1 255.255.224.0
Fa1/1 172.20.96.1 255.255.224.0
S0/0/0 10.0.0.10 255.255.255.252
ISP S0/0/0 209.165.201.1 255.255.255.252
Fa0/0 209.165.200.225 255.255.255.252
Web Server NIC 209.165.200.226 255.255.255.252
Task 1: Design and Document an Addressing Scheme
Step 1. Design an addressing scheme.
Based on the network requirements shown in Figure 3-6, design an appropriate addressing scheme.
■ The HQ, B1, B2, and B3 routers each have an address space. Subnet the address space based on the host requirements.
■ For each address space, assign subnet 0 to the Fa0/0 LAN, subnet 1 to the Fa0/1, and so on.
Step 2. Document the addressing scheme.
■ Use Table 3-10 to document the IP addresses and subnet masks. Assign the first IP address to the router interface.
■ For the WAN links, assign the first IP address to HQ.
Task 2: Apply a Basic Configuration
Using your documentation, configure the routers with basic configurations including addressing and host names. Use cisco as the line passwords and class as the secret password. Use 64000 as the clock rate. ISP is the DCE in its WAN link to HQ, and HQ is the DCE for all other WAN links.
Task 3: Configure Static and Default Routing
Configure static and default routing using the exit interface argument, according to the following criteria:
■ HQ should have three static routes and one default route.
■ B1, B2, and B3 should have one default route.
■ ISP should have seven static routes. This will include the three WAN links between HQ and the branch routers B1, B2, and B3.
Task 4: Test Connectivity and Examine the Configuration
Step 1. Test connectivity.
You should now have end-to-end connectivity. Use ping to test connectivity across the net-work. Each router should be able to ping all other router interfaces and the web server.
Use extended ping to test LAN connectivity to the web server. For example, to test the Fa0/0 interface on B1, you would do the following:
B1# ping
Protocol [ip]:
Target IP address: 209.165.200.226 Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: yes
Source address or interface: 192.168.1.1 Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 209.165.200.226, timeout is 2 seconds:
Packet sent with a source address of 192.168.1.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 67/118/138 ms
Troubleshoot until pings are successful.
Step 2. Examine the configuration.
Use verification commands to make sure that your configurations are complete.